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Regular Expression is a pattern describing a certain amount of text. Regular expressions are a language of their own.

Wiki defines Regular Expression as follows,

In computing, regular expressions provide a concise and flexible means for identifying strings of text of interest, such as particular characters, words, or patterns of characters. A regular expression (often shortened to regex or regexp) is written in a formal language that can be interpreted by a regular expression processor, a program that either serves as a parser generator or examines text and identifies parts that match the provided specification.

You would have come across the regular expressions patterns regardless of the programming language (Java, .Net, PHP, etc.,).

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Dave Child had created a brilliant Cheat Sheet that gives you all the basics of Regular Expression in one page. Worth to place this poster at your desk.

You can download the cheat sheet here :  PDF Format PNG Format

Cheat Sheet Credits : Dave Child. You can download more cheat sheets from www.addedbytes.com